I don't understand this. During my PhD my "scholarship" was just basically the university choosing not to charge me money. It's not as though I sat down and set on fire $20k worth of paper every year. So now they have to pay tax on to the amount they would have otherwise charged me? Isn't that kind of a hypothetical concept? Like, can't they say, "Oh the tuition for the civil engineering PhD program is now zero"? Vir…
The proper way to view it is that the university is giving you an "in kind" benefit, in this case a free education. "In kind" benefits are taxable. An employer cannot say, for example, that providing a free apartment to an employee is not compensation, because the employer is "simply choosing not to charge the employee rent."
Or, well, this is how it's done in some places in Europe, where benefits "in kind" are "taxed". Except they're not taxed. You can't make that happen.